CN107858496B - Steel bar heat treatment production line - Google Patents
Steel bar heat treatment production line Download PDFInfo
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- CN107858496B CN107858496B CN201711363591.9A CN201711363591A CN107858496B CN 107858496 B CN107858496 B CN 107858496B CN 201711363591 A CN201711363591 A CN 201711363591A CN 107858496 B CN107858496 B CN 107858496B
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- steel bar
- heat treatment
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- production line
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a steel bar heat treatment production line which comprises a bending rust removing mechanism, a rotary die, a wire drawing machine, a straightening mechanism, a first traction mechanism, a heat treatment device, a second traction mechanism and a wire collecting disc which are sequentially arranged along the running direction of a steel bar, wherein the heat treatment device comprises a first quenching furnace, a second quenching furnace and a third quenching furnace, a first water tank, a tempering furnace and a second water tank which are sequentially arranged along the running direction of the steel bar and used for quenching the steel bar, the first quenching furnace and the tempering furnace are solid intermediate frequency furnaces, the second quenching furnace and the third quenching furnace are solid superaudio furnaces, the induction coils of the tempering furnace are 3-5 knots, the capacitance capacity is 36-42 muf, and the running frequency is more than or equal to 7KHz. The steel bar heat treatment production line improves the tempering furnace, improves the operating frequency to more than 7.0KHz, improves the tempering temperature to more than 450 ℃, reduces the breaking ratio of the steel bar to 2.4 per mill, has obvious effect and greatly improves the product quality.
Description
Technical Field
The invention relates to a steel bar heat treatment production line, and belongs to the field of steel bar production for prestressed concrete.
Background
Along with the continuous expansion of the market of PC steel bars, the variety and the specification of the PC steel bars are also more and more rich. In order to save cost and reduce electricity charge, the tempering heating furnace of the existing steel bar production line has very low frequency, only 3.5KHz, and deeper heating depth when the frequency is lower, thus generating a disadvantage that the heating temperature is reduced by 15-20 ℃ under the same breaking load index, so that the tempering temperature is only 425-445 ℃.
Temperature is one of the important factors affecting the metal material and the way the engineered structure breaks. Many break accidents occur at low temperatures. This is because the temperature greatly affects the performance of low and medium strength structural steels and cast irons, which are widely used in engineering, and as the temperature decreases, the yield strength of the steel increases and the toughness decreases. As the temperature decreases, the fracture form of the notched impact specimen changes from ductile fracture to brittle fracture over a certain temperature range. The proportion of fracture between 425 and 445 ℃ of tempering temperature is 4 per mill through statistics. It can be seen that the existing steel bar heat treatment production line needs to be improved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a steel bar heat treatment production line.
In order to achieve the above purpose, the invention provides a steel bar heat treatment production line, which comprises a bending rust removing mechanism, a rotary die, a wire drawing machine, a straightening mechanism, a first traction mechanism, a heat treatment device, a second traction mechanism, a wire winding disc, a first quenching furnace, a second quenching furnace and a third quenching furnace, wherein the rotary die is used for scoring the steel bar, the wire drawing machine is used for drawing the steel bar, the straightening mechanism is used for straightening the steel bar, the first traction mechanism is used for traction the steel bar, the heat treatment device is used for heat treatment of the steel bar, the second traction mechanism is used for traction of the steel bar, the wire winding disc is used for winding the steel bar, the heat treatment device comprises a first quenching furnace, a second quenching furnace and a third quenching furnace are sequentially arranged along the running direction of the steel bar, the first water tank is used for cooling the steel bar after quenching, the tempering furnace is used for tempering the steel bar, the second water tank is used for cooling the steel bar after tempering, the first quenching furnace and the tempering furnace are solid medium-frequency furnaces, the second quenching furnace and the third quenching furnace are solid medium-frequency furnaces, the induction coils of the tempering furnace are 3-5 knots, the capacity of each knot is 33-36 mu f, and the frequency of running is greater than or equal to 7KHz.
Further, the induction coil of the tempering furnace is 4 sections.
Further, the capacitance capacity of the tempering furnace was 36 μf.
Further, the heat treatment device also comprises a first temperature detector for detecting the temperature of the quenching furnace and a second temperature detector for detecting the temperature of the quenching furnace.
Further, the steel bar heat treatment production line further comprises a frequency converter cabinet which is electrically connected with the rotary die, the wire drawing machine, the straightening mechanism, the first traction mechanism, the second traction mechanism and the wire drawing disc respectively, wherein the frequency converter cabinet is connected with a control console, and the control console is in control connection with the frequency converter cabinet through a PLC.
Still further, the console also includes a touch screen.
Still further, the touch screen is TP270.
Further, the number of the winding drums is two.
By adopting the technical scheme, the steel bar heat treatment production line improves the tempering furnace, reduces the inductance of the inductor and the capacitance capacity, controls the heating depth frequency by means of current frequency change, improves the operating frequency to be more than 7.0KHz, improves the tempering temperature to be more than 450 ℃, reduces the breaking proportion of the steel bar to 2.4 per mill, has obvious effect and greatly improves the product quality.
Drawings
Fig. 1a to 1c are schematic structural views of a steel bar heat treatment production line according to the present invention;
fig. 2 is a schematic diagram of the electrical system structure of the steel bar heat treatment production line of the invention.
The reference numerals in the figures are:
1. a bending rust removing mechanism; 2. a rotary die; 3. a wire drawing machine; 4. a straightening mechanism; 5. a first traction mechanism; 6. a heat treatment device; 61. a first quenching furnace; 62. a second quenching furnace; 63. a third quenching furnace; 64. a first water tank; 65. tempering furnace; 66. a second water tank; 67. a first thermometer; 68. a second thermometer; 7. a second traction mechanism; 8. a take-up reel; 9. a console; 91. a PLC; 92. a touch screen; 10. a frequency converter cabinet; 11. a pay-off rack; 12. a wire arranging cage; 13. a cleaning machine; 14. and (5) a shearing machine.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art.
Referring to fig. 1, the steel bar heat treatment production line in this embodiment includes a bending rust removing mechanism 1, a rotary die 2 for scoring the steel bar, a wire drawing machine 3 for drawing the steel bar, a straightening mechanism 4 for straightening the steel bar, a first traction mechanism 5 for traction of the steel bar, a heat treatment device 6 for heat treatment of the steel bar, a second traction mechanism 7 for traction of the steel bar, and a take-up reel 8 for winding and winding the steel bar, which are sequentially arranged along the running direction of the steel bar. Preferably, there are two take-up reels 8.
The heat treatment device 6 comprises a first quenching furnace 61, a second quenching furnace 62 and a third quenching furnace 63 which are sequentially arranged along the running direction of the steel rod and used for quenching the steel rod, a first water tank 64 used for cooling the quenched steel rod, a tempering furnace 65 used for tempering the steel rod, and a second water tank 66 used for cooling the tempered steel rod, wherein the first quenching furnace 61 and the tempering furnace 65 are solid medium-frequency furnaces, and the second quenching furnace 62 and the third quenching furnace 63 are solid superaudio furnaces.
The most important feature of induction heating is to control the depth of heating by means of the change in current frequency. Therefore, the current frequency is the most important process parameter to control the heating depth. Generally considered theoretically, there are the following relations:
in the formula (1), d is the heating depth in mm; mu is the magnetic permeability of the material; ρ is the resistivity of the material in Ω·cm; f is the frequency of the current in Hz.
Since the induction heating devices currently in use are parallel resonant device frequencies
In the formula (2), L is the inductance of the inductor; c is the capacitive reactance of the heating capacitor. Therefore, to increase the operating frequency, modifications can be made only in terms of reducing the inductance of the inductor and reducing the capacitance.
Through calculation and continuous experiment verification, the induction coil of the tempering furnace 65 has 3-5 sections, the number of turns of each section of coil is 33, the capacitance is reduced from 80 muf to 36-42 muf, and the operating frequency is greater than or equal to 7KHz.
In this embodiment, the induction coil of the tempering furnace 65 is 4 knots, and the capacitance capacity of the tempering furnace 65 is 36 μf.
In a more preferred embodiment, the heat treatment apparatus further comprises a first temperature detector 67 for detecting the temperature of the quenching furnace, and a second temperature detector 68 for detecting the temperature of the quenching furnace.
In this embodiment, the steel bar heat treatment production line further comprises a frequency converter cabinet 10 electrically connected with the rotary die 2, the wire drawing machine 3, the straightening mechanism 4, the first traction mechanism 5, the second traction mechanism 7 and the take-up reel 8 respectively, the rotary die 2, the wire drawing machine 3, the straightening mechanism 4, the first traction mechanism 5, the second traction mechanism 7 and the motor of the take-up reel 8 are driven to work through the frequency converter cabinet 10, the frequency converter cabinet 10 is connected with a control console 9, and the control console 9 is in control connection with the frequency converter cabinet 10 through a PLC 91.
The console 9 further includes a touch screen 92, in this embodiment, the touch screen 92 is TP270, and the PLC uses a CUP315. The whole production line is monitored by the PLC91 and the touch screen 92 together.
In a more preferred embodiment, the steel bar passes through the wire arranging cage 12 from the pay-off rack 11, and is subjected to rust removal by the bending rust removing mechanism 1; a cleaner 13 is arranged between the straightening mechanism 4 and the first tractor 5; a shearing machine 14 is arranged between the second traction mechanism 7 and the take-up reel 8.
Working principle:
the steel bar starts from a pay-off rack 11, enters a rotary die 2 through a bending rust removing mechanism 1 at a certain speed, completes on-line nicking in the rotary die 2 under the drawing action of a wire drawing machine 3, and then is straightened by a straightening mechanism 4 and then sent to a heat treatment device 6 for heat treatment under the traction of a first traction machine 5. Firstly, quenching treatment of the PC steel bar is completed in the first three quenching furnaces 61,62 and 63, after reaching a certain quenching temperature, the PC steel bar is cooled by water through a first water tank 64, tempering treatment of the PC steel bar is completed by a tempering furnace 65, after reaching a certain tempering temperature, the PC steel bar is cooled by water through a second water tank 66, and then enters a take-up reel 8 through a second traction mechanism 7.
The steel bar heat treatment production line improves the tempering furnace, reduces the inductance of the inductor and the capacitance, controls the heating depth frequency by means of current frequency change, improves the operating frequency to be more than 7.0KHz, improves the tempering temperature to be more than 450 ℃, reduces the breaking proportion of the steel bar to 2.4 per mill, has obvious effect and greatly improves the product quality.
The present invention has been described in detail with reference to the embodiments, but it is to be understood that the invention is not limited to the embodiments, and equivalent changes and modifications are intended to be included in the scope of the present invention, since it is intended that the invention is interpreted by those skilled in the art to which the present invention pertains.
Claims (8)
1. The utility model provides a steel bar heat treatment production line, it includes crooked rust cleaning mechanism (1) that sets gradually along the steel bar direction of operation, be used for carrying out nicking rotary die (2) to the steel bar, be used for carrying out drawing wire drawing machine (3) to the steel bar, be used for the steel bar to carry out alignment mechanism (4), be used for carrying out first traction mechanism (5) of traction to the steel bar, be used for carrying out heat treatment's heat treatment device (6) to the steel bar, be used for carrying out second traction mechanism (7) of traction to the steel bar, be used for carrying out coiling take-up reel (8) to the steel bar, its characterized in that: the heat treatment device (6) comprises a first quenching furnace (61), a second quenching furnace (62) and a third quenching furnace (63) which are sequentially arranged along the running direction of the steel rod and used for quenching the steel rod, a first water tank (64) used for cooling the quenched steel rod, a tempering furnace (65) used for tempering the steel rod, and a second water tank (66) used for cooling the tempered steel rod, wherein the first quenching furnace (61) and the tempering furnace (65) are solid medium-frequency furnaces, the second quenching furnace (62) and the third quenching furnace (63) are solid-state superaudio furnaces, the number of turns of each coil of the tempering furnace (65) is 33, the capacitance is 36-42 mu f, and the running frequency is more than or equal to 7KHz.
2. The steel bar heat treatment production line according to claim 1, wherein: the induction coil of the tempering furnace (65) is 4 sections.
3. The steel bar heat treatment production line according to claim 1, wherein: the capacitance of the tempering furnace (65) is 36 mu f.
4. The steel bar heat treatment production line according to claim 1, wherein: the heat treatment device also comprises a first temperature detector (67) for detecting the temperature of the quenching furnace and a second temperature detector (68) for detecting the temperature of the quenching furnace.
5. The steel bar heat treatment production line according to claim 1, wherein: still include respectively with rotary die (2), wire drawing machine (3), alignment mechanism (4), first traction mechanism (5), second traction mechanism (7), take-up reel (8) be connected converter cabinet (10) that are connected electrically, this converter cabinet (10) connection control cabinet (9), control cabinet (9) are connected with converter cabinet (10) control through PLC (91).
6. The steel bar heat treatment production line according to claim 5, wherein: the console also includes a touch screen (92).
7. The steel bar heat treatment production line according to claim 6, wherein: the touch screen (92) is TP270.
8. The steel bar heat treatment production line according to claim 1, wherein: the number of the winding drums (8) is two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711363591.9A CN107858496B (en) | 2017-12-18 | 2017-12-18 | Steel bar heat treatment production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711363591.9A CN107858496B (en) | 2017-12-18 | 2017-12-18 | Steel bar heat treatment production line |
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| Publication Number | Publication Date |
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| CN107858496A CN107858496A (en) | 2018-03-30 |
| CN107858496B true CN107858496B (en) | 2023-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711363591.9A Active CN107858496B (en) | 2017-12-18 | 2017-12-18 | Steel bar heat treatment production line |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112692585B (en) * | 2020-12-24 | 2021-12-28 | 天工俐德科技发展有限公司 | Production process and equipment for controllable slow-bonding steel bar |
| CN114854965A (en) * | 2022-05-23 | 2022-08-05 | 西华大学 | Vacuum high-temperature heat treatment device for sealing unidirectional stretching magnetic fluid |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001016857A (en) * | 1999-04-30 | 2001-01-19 | High Frequency Heattreat Co Ltd | Power converter |
| CN2618402Y (en) * | 2002-03-01 | 2004-05-26 | 松下电器产业株式会社 | Induction heater |
| CN201144263Y (en) * | 2007-11-22 | 2008-11-05 | 天津市金能电力电子有限公司 | Steel bar quenching and high temperature tempering production line |
| CN201149534Y (en) * | 2008-01-22 | 2008-11-12 | 南京高华科技有限公司 | Agglomeration type small-volume waterproof pressure sensor |
| CN201197202Y (en) * | 2008-03-10 | 2009-02-18 | 樊延强 | High-frequency electromagnetic inductive heating device |
| CN101570812A (en) * | 2009-03-27 | 2009-11-04 | 中国第一汽车集团公司 | Steering arm shaft induction heating tempering technology |
| CN207619473U (en) * | 2017-12-18 | 2018-07-17 | 常熟市龙腾滚动体制造有限公司 | Rod iron heat-treatment production line |
-
2017
- 2017-12-18 CN CN201711363591.9A patent/CN107858496B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001016857A (en) * | 1999-04-30 | 2001-01-19 | High Frequency Heattreat Co Ltd | Power converter |
| CN2618402Y (en) * | 2002-03-01 | 2004-05-26 | 松下电器产业株式会社 | Induction heater |
| CN201144263Y (en) * | 2007-11-22 | 2008-11-05 | 天津市金能电力电子有限公司 | Steel bar quenching and high temperature tempering production line |
| CN201149534Y (en) * | 2008-01-22 | 2008-11-12 | 南京高华科技有限公司 | Agglomeration type small-volume waterproof pressure sensor |
| CN201197202Y (en) * | 2008-03-10 | 2009-02-18 | 樊延强 | High-frequency electromagnetic inductive heating device |
| CN101570812A (en) * | 2009-03-27 | 2009-11-04 | 中国第一汽车集团公司 | Steering arm shaft induction heating tempering technology |
| CN207619473U (en) * | 2017-12-18 | 2018-07-17 | 常熟市龙腾滚动体制造有限公司 | Rod iron heat-treatment production line |
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| CN107858496A (en) | 2018-03-30 |
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